Type this in to google search and you will find videos and articles....

"how to convert carport to greenhouse"

I'll just figure it out on my own, disregard my question. I would've never thought to check Google and gotten tons of results for converting a standalone metal frame carport. After all, we live in the days of Google and would rather consult a computer instead of human beings that could possibly already know what it is that we're looking for. Thanks anyway.

Your results on Google will also come from human beings.

Kicking and screaming into the 21st century, huh?

You probably have done it by now, but I would suggest using twinwall polycarbonate sheets. In 7a I would probably stick with the clear 8mm twinwall. I have had several customers buy the carport frames that you see everywhere and cover them this way. The only issue is that you may need to add purlins depending on the spacing of the existing frame. Here is a quick guide to installing polycarbonate, the purlin spacing is at the bottom of page 2.